The wording is terrible I agree. As it reads, I assume you could accelerate above 800ft provided that acceleration doesn't require flap retraction.
Quoting CAR93.59 (NZ Regs)
93.59 Departure noise abatement procedures
(a) A pilot-in-command of a turbo-jet or turbo-fan powered aeroplane must-
(1) on departure from runway 23, comply with—
(i) the ICAO noise abatement take-off climb – Procedure A or B, defined in ICAO Doc 8168–Ops–611, Volume 1; or
(ii) the noise abatement departure profile – Procedure C, as specified in Appendix D; and
(2) on departure from runway 05, comply with—
(i) the ICAO noise abatement take-off climb – Procedure B defined in ICAO Doc 8168–Ops–611, Volume 1; or
(ii) the noise abatement departure profile – Procedure C, as specified in Appendix D.
So just comply with ICAO and ignore Aucklands poorly worded procedure.